研究人员用立体声系统对着雌泡蟾和食蛙蝙蝠播放了不同的雄性的鸣音，观察它们最先接近哪一种鸣叫的来源。
The researchers played different túngara frog songs to female frogs and frog-eating bats on a stereo in order to see which speaker they approached first.
他详细阐述道“他们是最先想到MP3播放器的吗？”
He elaborates: "Were they the first ones to come up with an MP3 player?"
他详细阐述道“他们是最先想到MP3播放器的吗？”
He elaborates: "Were they the first ones to come up with an MP3 player?"
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